[rrd-developers] Update ex post?

Tobias Oetiker tobi at oetiker.ch
Tue Aug 24 17:39:27 CEST 2010

Hi Thorsten,

Today Thorsten von Eicken wrote:

> > So, what's the approach those tools are using (I've never looked at any
> > of those [nor have I looked *for* any ;-)])?
> >
> > Cheers,
> > Sebastian
> >
> The splicing could also be very useful for restoring data. E.g., if a
> monitoring server dies we can quickly replace it with a new one, but
> that doesn't have any data. So all the RRDs start out empty and record
> new data coming in. When we get the data from the failed one restored,
> we'd like to splice the old and new together.

another option (without modifying the actual rrd files) would be to
asemble them while graphing based on information about which host
was providing the service for what time span ... using a CDEF to
turn all data outside the active periode to Unknown.

> I'm not expecting someone else to build the above and it's still a
> little out on the roadmap here. I have a bunch of other exciting stuff
> to contribute to rrdtool in the pipeline... I just wanted to chime in :-).


Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900

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